<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <!-- 引入Vue -->
  <script type="text/javascript" src="../js/vue.js"></script>
</head>

<body>
  <!-- 准备一个容器 -->
  <div id="root">
    姓：<input type="text" v-model="firstName"><br /><br />
    名：<input type="text" v-model="lastName"><br /><br />
    全名:<span>{{fullName}}</span><br /><br />
    <!-- 错误写法 -->
    <!-- 全名:<span>{{fullName()}}</span><br /><br /> -->
  </div>
</body>
<script type="text/javascript">
  Vue.config.productionTip = false; //阻止vue在启动时产生产提示
  let vm = new Vue({
    el: '#root',
    data: {
      firstName: '张',
      lastName: '三'
    },
    computed: {
      // 完整写法
      /*
      fullName: {
        get () {
          return this.firstName + '-' + this.lastName
        },
        set (value) {
          let arr = value.split('-')
          this.firstName = arr[0]
          this.lastName = arr[1]
        }
      } 
      */
      //简写，不考虑修改
      fullName () {
        return this.firstName + '-' + this.lastName
      }
    }
  })
</script>

</html>